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<title>class Gem::Source - rubygems: Ruby Standard Library Documentation</title>


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  <h3>Parent</h3>

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    <li><span class="include">Comparable</span>
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<!-- Method Quickref -->
<div id="method-list-section" class="nav-section">
  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-i-3C-3D-3E">#&lt;=&gt;</a>
    <li ><a href="#method-i-cache_dir">#cache_dir</a>
    <li ><a href="#method-i-download">#download</a>
    <li ><a href="#method-i-enforce_trailing_slash">#enforce_trailing_slash</a>
    <li ><a href="#method-i-fetch_spec">#fetch_spec</a>
    <li ><a href="#method-i-load_specs">#load_specs</a>
    <li ><a href="#method-i-typo_squatting-3F">#typo_squatting?</a>
    <li ><a href="#method-i-update_cache-3F">#update_cache?</a>
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    <div id='extraz'><div class='adzbox-index'  >
      
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    <main role="main" aria-labelledby="class-Gem::Source">
    <h1 id="class-Gem::Source" class="class">
      class Gem::Source
    </h1>

    <section class="description">
    
<p>A <a href="Source.html"><code>Source</code></a> knows how to list and fetch gems from a RubyGems marshal index.</p>

<p>There are other <a href="Source.html"><code>Source</code></a> subclasses for installed gems, local gems, the bundler dependency API and so-forth.</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">



        <section class="attribute-method-details" class="method-section">
        <header>
        <h3>Attributes</h3>
        </header>

          <div id="attribute-i-uri" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">uri</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              <p>The URI this source will fetch gems from.</p>
              </div>
            </div>
            </section>


                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(uri)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates a new <a href="Source.html"><code>Source</code></a> which will use the index located at <code>uri</code>.</p>

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 28</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">uri</span>)
  <span class="ruby-identifier">require_relative</span> <span class="ruby-string">&quot;uri&quot;</span>
  <span class="ruby-ivar">@uri</span> = <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Uri</span>.<span class="ruby-identifier">parse!</span>(<span class="ruby-identifier">uri</span>)
  <span class="ruby-ivar">@update_cache</span> = <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-3C-3D-3E" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">&lt;=&gt;</span><span
                                class="method-args">(other)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Sources are ordered by installation preference.</p>

                              <div class="method-source-code" id="3C-3D-3E-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 37</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">&lt;=&gt;</span>(<span class="ruby-identifier">other</span>)
  <span class="ruby-keyword">case</span> <span class="ruby-identifier">other</span>
  <span class="ruby-keyword">when</span> <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Source</span><span class="ruby-operator">::</span><span class="ruby-constant">Installed</span>,
       <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Source</span><span class="ruby-operator">::</span><span class="ruby-constant">Local</span>,
       <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Source</span><span class="ruby-operator">::</span><span class="ruby-constant">Lock</span>,
       <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Source</span><span class="ruby-operator">::</span><span class="ruby-constant">SpecificFile</span>,
       <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Source</span><span class="ruby-operator">::</span><span class="ruby-constant">Git</span>,
       <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Source</span><span class="ruby-operator">::</span><span class="ruby-constant">Vendor</span> <span class="ruby-keyword">then</span>
    <span class="ruby-value">-1</span>
  <span class="ruby-keyword">when</span> <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Source</span> <span class="ruby-keyword">then</span>
    <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@uri</span>
      <span class="ruby-keyword">return</span> <span class="ruby-value">0</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">uri</span>
      <span class="ruby-keyword">return</span> <span class="ruby-value">1</span>
    <span class="ruby-keyword">end</span>

    <span class="ruby-keyword">return</span> <span class="ruby-value">-1</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">uri</span>

    <span class="ruby-comment"># Returning 1 here ensures that when sorting a list of sources, the</span>
    <span class="ruby-comment"># original ordering of sources supplied by the user is preserved.</span>
    <span class="ruby-keyword">return</span> <span class="ruby-value">1</span> <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@uri</span>.<span class="ruby-identifier">to_s</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">uri</span>.<span class="ruby-identifier">to_s</span>

    <span class="ruby-value">0</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-cache_dir" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">cache_dir</span><span
                                class="method-args">(uri)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Returns the local directory to write <code>uri</code> to.</p>

                              <div class="method-source-code" id="cache_dir-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 101</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">cache_dir</span>(<span class="ruby-identifier">uri</span>)
  <span class="ruby-comment"># Correct for windows paths</span>
  <span class="ruby-identifier">escaped_path</span> = <span class="ruby-identifier">uri</span>.<span class="ruby-identifier">path</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp">%r{^/([a-z]):/}i</span>, <span class="ruby-string">&#39;/\\1-/&#39;</span>)
  <span class="ruby-identifier">escaped_path</span>.<span class="ruby-identifier">tap</span>(<span class="ruby-operator">&amp;</span><span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">UNTAINT</span>)

  <span class="ruby-constant">File</span>.<span class="ruby-identifier">join</span> <span class="ruby-constant">Gem</span>.<span class="ruby-identifier">spec_cache_dir</span>, <span class="ruby-node">&quot;#{uri.host}%#{uri.port}&quot;</span>, <span class="ruby-constant">File</span>.<span class="ruby-identifier">dirname</span>(<span class="ruby-identifier">escaped_path</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-download" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">download</span><span
                                class="method-args">(spec, dir=Dir.pwd)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Downloads <code>spec</code> and writes it to <code>dir</code>.  See also <a href="RemoteFetcher.html#method-i-download"><code>Gem::RemoteFetcher#download</code></a>.</p>

                              <div class="method-source-code" id="download-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 208</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">download</span>(<span class="ruby-identifier">spec</span>, <span class="ruby-identifier">dir</span>=<span class="ruby-constant">Dir</span>.<span class="ruby-identifier">pwd</span>)
  <span class="ruby-identifier">fetcher</span> = <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">RemoteFetcher</span>.<span class="ruby-identifier">fetcher</span>
  <span class="ruby-identifier">fetcher</span>.<span class="ruby-identifier">download</span> <span class="ruby-identifier">spec</span>, <span class="ruby-identifier">uri</span>.<span class="ruby-identifier">to_s</span>, <span class="ruby-identifier">dir</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-fetch_spec" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">fetch_spec</span><span
                                class="method-args">(name_tuple)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Fetches a specification for the given <code>name_tuple</code>.</p>

                              <div class="method-source-code" id="fetch_spec-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 125</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">fetch_spec</span>(<span class="ruby-identifier">name_tuple</span>)
  <span class="ruby-identifier">fetcher</span> = <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">RemoteFetcher</span>.<span class="ruby-identifier">fetcher</span>

  <span class="ruby-identifier">spec_file_name</span> = <span class="ruby-identifier">name_tuple</span>.<span class="ruby-identifier">spec_name</span>

  <span class="ruby-identifier">source_uri</span> = <span class="ruby-identifier">enforce_trailing_slash</span>(<span class="ruby-identifier">uri</span>) <span class="ruby-operator">+</span> <span class="ruby-node">&quot;#{Gem::MARSHAL_SPEC_DIR}#{spec_file_name}&quot;</span>

  <span class="ruby-identifier">cache_dir</span> = <span class="ruby-identifier">cache_dir</span> <span class="ruby-identifier">source_uri</span>

  <span class="ruby-identifier">local_spec</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">join</span> <span class="ruby-identifier">cache_dir</span>, <span class="ruby-identifier">spec_file_name</span>

  <span class="ruby-keyword">if</span> <span class="ruby-constant">File</span>.<span class="ruby-identifier">exist?</span> <span class="ruby-identifier">local_spec</span>
    <span class="ruby-identifier">spec</span> = <span class="ruby-constant">Gem</span>.<span class="ruby-identifier">read_binary</span> <span class="ruby-identifier">local_spec</span>
    <span class="ruby-identifier">spec</span> = <span class="ruby-keyword">begin</span>
             <span class="ruby-constant">Marshal</span>.<span class="ruby-identifier">load</span>(<span class="ruby-identifier">spec</span>)
           <span class="ruby-keyword">rescue</span> <span class="ruby-constant">StandardError</span>
             <span class="ruby-keyword">nil</span>
           <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">spec</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">spec</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">source_uri</span>.<span class="ruby-identifier">path</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot;.rz&quot;</span>

  <span class="ruby-identifier">spec</span> = <span class="ruby-identifier">fetcher</span>.<span class="ruby-identifier">fetch_path</span> <span class="ruby-identifier">source_uri</span>
  <span class="ruby-identifier">spec</span> = <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Util</span>.<span class="ruby-identifier">inflate</span> <span class="ruby-identifier">spec</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">update_cache?</span>
    <span class="ruby-identifier">require</span> <span class="ruby-string">&quot;fileutils&quot;</span>
    <span class="ruby-constant">FileUtils</span>.<span class="ruby-identifier">mkdir_p</span> <span class="ruby-identifier">cache_dir</span>

    <span class="ruby-constant">File</span>.<span class="ruby-identifier">open</span> <span class="ruby-identifier">local_spec</span>, <span class="ruby-string">&quot;wb&quot;</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">io</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">io</span>.<span class="ruby-identifier">write</span> <span class="ruby-identifier">spec</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-comment"># TODO: Investigate setting Gem::Specification#loaded_from to a URI</span>
  <span class="ruby-constant">Marshal</span>.<span class="ruby-identifier">load</span> <span class="ruby-identifier">spec</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-load_specs" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">load_specs</span><span
                                class="method-args">(type)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Loads <code>type</code> kind of specs fetching from +@uri+ if the on-disk cache is out of date.</p>

<p><code>type</code> is one of the following:</p>

<p>:released   =&gt; Return the list of all released specs :latest     =&gt; Return the list of only the highest version of each gem :prerelease =&gt; Return the list of all prerelease only specs</p>

                              <div class="method-source-code" id="load_specs-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 175</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">load_specs</span>(<span class="ruby-identifier">type</span>)
  <span class="ruby-identifier">file</span>       = <span class="ruby-constant">FILES</span>[<span class="ruby-identifier">type</span>]
  <span class="ruby-identifier">fetcher</span>    = <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">RemoteFetcher</span>.<span class="ruby-identifier">fetcher</span>
  <span class="ruby-identifier">file_name</span>  = <span class="ruby-node">&quot;#{file}.#{Gem.marshal_version}&quot;</span>
  <span class="ruby-identifier">spec_path</span>  = <span class="ruby-identifier">enforce_trailing_slash</span>(<span class="ruby-identifier">uri</span>) <span class="ruby-operator">+</span> <span class="ruby-node">&quot;#{file_name}.gz&quot;</span>
  <span class="ruby-identifier">cache_dir</span>  = <span class="ruby-identifier">cache_dir</span> <span class="ruby-identifier">spec_path</span>
  <span class="ruby-identifier">local_file</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">join</span>(<span class="ruby-identifier">cache_dir</span>, <span class="ruby-identifier">file_name</span>)
  <span class="ruby-identifier">retried</span>    = <span class="ruby-keyword">false</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">update_cache?</span>
    <span class="ruby-identifier">require</span> <span class="ruby-string">&quot;fileutils&quot;</span>
    <span class="ruby-constant">FileUtils</span>.<span class="ruby-identifier">mkdir_p</span> <span class="ruby-identifier">cache_dir</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">spec_dump</span> = <span class="ruby-identifier">fetcher</span>.<span class="ruby-identifier">cache_update_path</span> <span class="ruby-identifier">spec_path</span>, <span class="ruby-identifier">local_file</span>, <span class="ruby-identifier">update_cache?</span>

  <span class="ruby-keyword">begin</span>
    <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">NameTuple</span>.<span class="ruby-identifier">from_list</span> <span class="ruby-constant">Marshal</span>.<span class="ruby-identifier">load</span>(<span class="ruby-identifier">spec_dump</span>)
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">ArgumentError</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">update_cache?</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-operator">!</span><span class="ruby-identifier">retried</span>
      <span class="ruby-constant">FileUtils</span>.<span class="ruby-identifier">rm</span> <span class="ruby-identifier">local_file</span>
      <span class="ruby-identifier">retried</span> = <span class="ruby-keyword">true</span>
      <span class="ruby-keyword">retry</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">raise</span> <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>.<span class="ruby-identifier">new</span>(<span class="ruby-node">&quot;Invalid spec cache file in #{local_file}&quot;</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-typo_squatting-3F" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">typo_squatting?</span><span
                                class="method-args">(host, distance_threshold=4)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="typo_squatting-3F-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 226</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">typo_squatting?</span>(<span class="ruby-identifier">host</span>, <span class="ruby-identifier">distance_threshold</span>=<span class="ruby-value">4</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@uri</span>.<span class="ruby-identifier">host</span>.<span class="ruby-identifier">nil?</span>
  <span class="ruby-identifier">levenshtein_distance</span>(<span class="ruby-ivar">@uri</span>.<span class="ruby-identifier">host</span>, <span class="ruby-identifier">host</span>).<span class="ruby-identifier">between?</span> <span class="ruby-value">1</span>, <span class="ruby-identifier">distance_threshold</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-update_cache-3F" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">update_cache?</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Returns true when it is possible and safe to update the cache directory.</p>

                              <div class="method-source-code" id="update_cache-3F-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 112</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">update_cache?</span>
  <span class="ruby-keyword">return</span> <span class="ruby-ivar">@update_cache</span> <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@update_cache</span>.<span class="ruby-identifier">nil?</span>
  <span class="ruby-ivar">@update_cache</span> =
    <span class="ruby-keyword">begin</span>
      <span class="ruby-constant">File</span>.<span class="ruby-identifier">stat</span>(<span class="ruby-constant">Gem</span>.<span class="ruby-identifier">user_home</span>).<span class="ruby-identifier">uid</span> <span class="ruby-operator">==</span> <span class="ruby-constant">Process</span>.<span class="ruby-identifier">uid</span>
    <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Errno</span><span class="ruby-operator">::</span><span class="ruby-constant">ENOENT</span>
      <span class="ruby-keyword">false</span>
    <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="private-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Private Instance Methods</h3>
                </header>

                  <div id="method-i-enforce_trailing_slash" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">enforce_trailing_slash</span><span
                                class="method-args">(uri)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="enforce_trailing_slash-source">
            <pre><span class="ruby-comment"># File rubygems/source.rb, line 233</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">enforce_trailing_slash</span>(<span class="ruby-identifier">uri</span>)
  <span class="ruby-identifier">uri</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-identifier">uri</span>.<span class="ruby-identifier">path</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r{/+$}</span>, <span class="ruby-string">&quot;&quot;</span>) <span class="ruby-operator">+</span> <span class="ruby-string">&quot;/&quot;</span>)
<span class="ruby-keyword">end</span></pre>
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